My 2 ½ yr old girl, refuses to go potty. She sees her older and younger cousins go potty, but when I mention no more diapers she'll cry and try to put her diaper on herself. Eventually she'll move on from that and sit on her toddler potty, but as soon as she has to go she insist to get off the potty and go on the floor. Ive tried offering rewards but she doesnt care for it. I'm feeling discouraged and I don't know how to make her stay on the potty when she needs to go. What do you guys suggest?